The D.O.C. Ribeiro Viticultural Zoning in D.O.C. Ribeiro (Galicia, NW Spain)  Extension. There are 3000 ha in the region. Of these, 2700 are registered within the D.O.C.  Production: annual average of 18000 t of grapes and 13,5 millions litres of wine.  Number of cellars: 100 cellars.  5770 wine growers are involved.

Objectives Viticultural Zoning in D.O.C. Ribeiro (Galicia, NW Spain) Objectives: 1) To identify the most favorable conditions for different varieties with regards to altitude and orientation. 2) To identify the conditions where maturity problems start to arise.

Hypothesis Viticultural Zoning in D.O.C. Ribeiro (Galicia, NW Spain) Hypothesis: 1) Potential Alcohol Content (PAC) can be used as a reference to evaluate the adaptation of different vine varieties to the environment. 2) A GIS allows us to identify the most favorable topographical conditions with regards to grape maturity for each one of the varieties considered. 3) A GIS also can be used to identify topographical conditions where maturity problems arise.

Materials Viticultural Zoning in D.O.C. Ribeiro (Galicia, NW Spain)  Meteorological data from the regional agency of agriculture and the Spanish National Institute of Meteorology.  5500 PAC measurements corresponding to 6,9 million kilograms of grapes.  Digital Terrain Model (DTM) from the Spanish National Geographic Institute.  Landuse map from the Spanish Ministry of National Agriculture.  Township map from the Society for the Regional Development of Galicia.

Methods Viticultural Zoning in D.O.C. Ribeiro (Galicia, NW Spain)  Statistics (descriptive and classification) of meteorological data.  By means of GIS Geomedia, maps of elevation and orientation where generated from the DTM.  The vineyard areas from the landuse maps where overlain over the DTM layers so that their mean elevation, and predominant orientations could be computed.  Relationships among PAC and mean elevation, and predominant orientations were characterized with SPSS.

Conclusions Viticultural Zoning in D.O.C. Ribeiro (Galicia, NW Spain)  PACs can be used as a reference to evaluate the adaptation of different vine varieties to the environment.  GIS allows us to relate topographic parameters to vineyard areas and their PACs. In this way, it is possible to identify conditions where maturity problems start to arise for each variety studied.  Palomino PACs are much lower than those of traditional varieties and it is scarcely influenced by orientation or altitude below 325m. These characteristics justify the ongoing substitution of this variety with traditional ones which achieve higher PACs.

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